Light-emitting module and lens

Abstract

A light-emitting module includes: a first light source unit including: a first light source, and a first lens on which light emitted from the first light source is incident; a driver configured to rotate the first lens; and a controller configured to, conjunctively with the driver, control an output of the first light source. A central axis of light emitted from the first lens is oblique to a rotation axis of the first lens. The controller is configured to control the output of the first light source according to a position along a trajectory of the central axis of the light emitted from the first lens.

The invention claimed is: 
     
       1. A light-emitting module comprising:
 a first light source unit comprising:
 a first light source, and 
 a first lens that includes a light-incident surface on which light emitted from the first light source is incident, wherein the light-incident surface comprises a convex portion; 
 
 a driver configured to rotate the first lens such that a central axis of light emitted from the first lens moves on a circumferential trajectory; and 
 a controller configured to, conjunctively with the driver, control an output of the first light source; wherein: 
 the central axis of the light emitted from the first lens is oblique to a rotation axis of the first lens; and 
 the controller is configured to control the output of the first light source according to a position, on the circumferential trajectory, of the central axis of the light emitted from the first lens. 
 
     
     
       2. The light-emitting module according to  claim 1 , wherein:
 the driver is configured to rotate the first lens with respect to the first light source. 
 
     
     
       3. The light-emitting module according to  claim 1 , wherein
 the driver is configured to rotate the first light source unit. 
 
     
     
       4. The light-emitting module according to  claim 3 , further comprising:
 a second light source unit comprising:
 a second light source, and 
 a second lens on which light emitted from the second light source is incident; and 
 
 a substrate to which the first and second light source units are mounted; wherein: 
 the driver is configured to rotate the second light source unit together with the first light source unit by rotating the substrate; 
 the controller is configured to, conjunctively with the driver, control an output of the second light source; and 
 a central axis of light emitted from the second lens is oblique to the rotation axis. 
 
     
     
       5. The light-emitting module according to  claim 4 , wherein:
 an angle between the rotation axis and the central axis of the light emitted from the second lens is different from an angle between the rotation axis and the central axis of the light emitted from the first lens. 
 
     
     
       6. The light-emitting module according to  claim 4 , wherein:
 an angle between the rotation axis and the central axis of the light emitted from the second lens is equal to an angle between the rotation axis and the central axis of the light emitted from the first lens; 
 the light emitted from the first light source is white light; and 
 the light emitted from the second light source is white light having a color temperature different from a color temperature of the light emitted from the first light source. 
 
     
     
       7. The light-emitting module according to  claim 4 , wherein:
 an angle between the rotation axis and the central axis of the light emitted from the second lens is greater than an angle between the rotation axis and the central axis of the light emitted from the first lens; and 
 a surface area of a light-emitting surface of the second light source is greater than a surface area of a light-emitting surface of the first light source. 
 
     
     
       8. The light-emitting module according to  claim 4 , wherein:
 the first light source unit and the second light source unit are on the substrate at a circumference centered on the rotation axis. 
 
     
     
       9. The light-emitting module according to  claim 1 , wherein:
 the light emitted from the first lens is divided into a plurality of subdivisions on a trajectory of the central axis of the light emitted from the first lens; and 
 the controller is configured to control the output of the first light source in the plurality of subdivisions. 
 
     
     
       10. The light-emitting module according to  claim 1 , wherein:
 the first lens includes:
 a light-reflective surface located at a periphery of the light-incident surface, wherein the light-reflective surface is a total reflection surface that totally reflects light; and 
 a light-emission surface positioned at a side opposite to the light-incident surface, the light-emission surface emitting light entering through the light-incident surface. 
 
 
     
     
       11. The light-emitting module according to  claim 10 , wherein:
 the light-emission surface is oblique to the rotation axis. 
 
     
     
       12. The light-emitting module according to  claim 10 , wherein:
 the light-reflective surface includes:
 a first perimeter edge facing toward the first light source from the first lens, and 
 a second perimeter edge positioned at a side opposite to the first perimeter edge; and 
 
 a line connecting a center of the first perimeter edge and a center of the second perimeter edge is oblique to the rotation axis. 
 
     
     
       13. The light-emitting module according to  claim 1 , wherein:
 the first lens is a convex lens; and 
 an optical axis of the first lens is oblique to the rotation axis. 
 
     
     
       14. A light-transmitting member comprising:
 a first lens configured to emit light such that a central axis of the light emitted from the first lens is oriented at a first angle relative to a central axis of the light-transmitting member, wherein the first lens includes a light-incident surface comprising a convex portion; and 
 a second lens configured to emit light such that a central axis of the light emitted from the second lens is oriented at a second angle relative to the central axis of the light-transmitting member, the second lens arranged adjacent to the first lens in a circumferential direction around the central axis of the light-transmitting member, the second angle different than the first angle. 
 
     
     
       15. The light-transmitting member according to  claim 14 , wherein:
 the first lens includes:
 a light-reflective surface located at a periphery of the light-incident surface, wherein the light-reflective surface is a total reflection surface that totally reflects light; and 
 a light-emission surface positioned at a side opposite to the light-incident surface, the light-emission surface emitting light entering through the light-incident surface. 
 
 
     
     
       16. The light-transmitting member according to  claim 14 , wherein:
 the first lens includes a first emission surface oriented at a third angle relative to the central axis of the light-transmitting member; and 
 the second lens includes a second emission surface oriented at a fourth angle relative to the central axis of the light-transmitting member, the fourth angle different than the third angle. 
 
     
     
       17. The light-transmitting member according to  claim 16 , wherein:
 the second emission surface is contiguous with the first emission surface. 
 
     
     
       18. The light-transmitting member according to  claim 16 , wherein:
 the first emission surface and the second emission surface are flat surfaces. 
 
     
     
       19. The light-transmitting member according to  claim 14 , wherein:
 the first lens is formed from a first material with a first refractive index; and 
 the second lens is formed from a second material with a second refractive index, the second refractive index different from the first refractive index.